JP3503100B2 - Dynamic loading test method for piles - Google Patents
Dynamic loading test method for pilesInfo
- Publication number
- JP3503100B2 JP3503100B2 JP32612296A JP32612296A JP3503100B2 JP 3503100 B2 JP3503100 B2 JP 3503100B2 JP 32612296 A JP32612296 A JP 32612296A JP 32612296 A JP32612296 A JP 32612296A JP 3503100 B2 JP3503100 B2 JP 3503100B2
- Authority
- JP
- Japan
- Prior art keywords
- pile
- load
- test method
- hammer
- dynamic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、杭の動的載荷試
験法に関し、さらに詳細には、動的ではあるが、静的載
荷試験に限りなく近づけた長周期動的載荷試験法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile dynamic load test method, and more particularly, to a long-period dynamic load test method which is as close as possible to a dynamic but static load test.
【０００２】[0002]
【従来の技術】従来、杭の支持力及び沈下量に関する情
報を得るために、あるいは杭の設計支持力の妥当性を確
認する目的のために、鉛直載荷試験が実施されている。
鉛直載荷試験としては、反力杭方式のものが知られ、数
多く実施されている。この試験方式は、試験杭の周囲に
反力杭やアンカーなどを設置し、その摩擦力を載荷重の
反力とするものである。反力杭方式は加力装置（ジャッ
キ）により杭頭に載荷重を徐々に加えることから、静的
載荷試験として位置づけられるが、加力装置や反力装置
などの載荷架構が大がかりなものとなり、試験の準備・
実施に長期間を要し、また組立て・解体に多大な費用が
要求される。2. Description of the Related Art Conventionally, a vertical loading test has been carried out in order to obtain information on bearing capacity and sinking amount of piles or to confirm the validity of design bearing capacity of piles.
As a vertical loading test, a reaction pile method is known and many tests have been conducted. In this test method, reaction piles and anchors are installed around the test piles, and the frictional force is used as the reaction force of the applied load. The reaction pile method is positioned as a static load test because the load is gradually applied to the pile head by a force device (jack), but it is regarded as a static load test, but the load frame such as the force device and the reaction device becomes large. Exam preparation
It takes a long time to carry out, and a large amount of cost is required for assembling and disassembling.
【０００３】一方、近年、新しい載荷試験法として、動
的載荷試験法が提案されている。この動的載荷試験法
は、杭頭をハンマで打撃し、杭頭近くで測定された加速
度・ひずみなどのデータから、静的な杭支持力や荷重〜
沈下関係を推定する方法である。この試験法は静的載荷
試験法のような反力装置が不要であり、試験時間も短く
て済む利点がある。しかし、その反面、載荷時間が０．
００５〜０．０３秒と短いことから、静的支持力を推定
するためには、杭体を一次元弾性体とみなし、波動理論
による複雑な解析が必要になる。On the other hand, in recent years, a dynamic load test method has been proposed as a new load test method. This dynamic loading test method hits the pile head with a hammer, and from the data such as acceleration and strain measured near the pile head, the static pile support force and load ~
This is a method of estimating the settlement relationship. This test method has an advantage that a reaction force device unlike the static load test method is not required and the test time can be shortened. However, on the other hand, the loading time is 0.
Since it is as short as 005 to 0.03 seconds, in order to estimate the static bearing capacity, the pile body is regarded as a one-dimensional elastic body, and complicated analysis by the wave theory is required.
【０００４】このようなことから、載荷時間を０．０５
〜０．２秒と動的載荷試験法の約１０倍程度に長くす
る、いわゆる長周期動的載荷試験法がいくつか提案され
ている。この試験法によれば、杭体に発生する波動現象
が無視できることから、杭体を剛体として扱えるように
なり、その結果、静的支持力を推定するのに解析が比較
的容易な振動理論が適用できるようになる。Therefore, the loading time is 0.05
Several so-called long-period dynamic load test methods have been proposed, which is about 0.2 seconds, which is about 10 times longer than the dynamic load test method. According to this test method, the wave phenomenon occurring in the pile body can be ignored, so that the pile body can be treated as a rigid body, and as a result, the vibration theory that is relatively easy to analyze to estimate the static bearing capacity is It will be applicable.
【０００５】このような長周期動的載荷試験法として、
現在、スタナミック試験法（急速載荷試験法）及びスー
ドスタティック試験法（準静的載荷試験法）が知られて
いる。スタナミック試験法は、特殊な推進薬を燃焼させ
て反力マスを打上げ、その時の反力で杭頭に載荷する方
法である。また、スードスタティック試験法は、杭頭に
バネを介在させてハンマを落下させることにより、載荷
する方法である。As such a long period dynamic load test method,
Currently, the stannamic test method (rapid load test method) and the pseudo static test method (quasi-static load test method) are known. The stannamic test method is a method in which a special propellant is burned to launch a reaction force mass and the reaction force at that time loads the pile head onto the pile head. The pseudostatic test method is a method in which a spring is placed on the pile head and a hammer is dropped to load the pile.
【０００６】これらの試験法は、前記のように載荷時間
（打撃力の継続時間）を長くすることにより、打撃力を
長周期（低周波数）とし、杭・地盤系の応答を静的に近
い状態にしようとするものである。ここで、打撃力の周
波数がゼロの場合が、静的な状態である。しかし、これ
らの試験法は、いずれも反力マスやハンマを大きくする
ことにより打撃力を長周期とするものであることから、
載荷装置が大がかりとなる。したがって、地盤の応答を
静的状態に近づけるには限度がある。In these test methods, the impact time is made to have a long cycle (low frequency) by prolonging the loading time (the duration of impact force) as described above, and the response of the pile-soil system is close to static. It is something that is going to be in a state. Here, the case where the frequency of the striking force is zero is a static state. However, in all of these test methods, the impact force has a long cycle by increasing the reaction mass and hammer,
The loading device becomes large-scale. Therefore, there is a limit to how the ground response can approach the static state.
【０００７】[0007]
【発明が解決しようとする課題】この発明は上記のよう
な技術的背景に基づいてなされたものであって、次の目
的を達成するものである。The present invention has been made based on the above technical background, and achieves the following objects.
【０００８】この発明の目的は、分割ハンマによる荷重
の周波数を制御することを可能とし、限りなく静的な状
態に近づいた杭・地盤系の応答を得ることができる杭の
動的載荷試験法を提供することにある。An object of the present invention is to provide a dynamic load test method for piles, which makes it possible to control the frequency of the load by the split hammer and obtain the response of the pile-soil system approaching a static state as much as possible. To provide.
【０００９】[0009]
【課題を解決するための手段】この発明は上記課題を達
成するために、次のような手段を採用している。The present invention employs the following means in order to achieve the above object.
【００１０】すなわちこの発明は、杭頭にハンマを落下
させ、杭・地盤系の応答から杭の支持力を推定する動的
載荷試験法において、前記ハンマとして複数に分割され
た分割ハンマを用い、前記分割ハンマを一定時間間隔で
杭頭に順次落下させることを特徴とする杭の動的載荷試
験法にある。That is, according to the present invention, a hammer is dropped on a pile head, and in a dynamic load test method for estimating a bearing capacity of a pile from a response of a pile-ground system, a plurality of divided hammers are used as the hammer, According to another aspect of the present invention, there is provided a dynamic loading test method for piles, characterized in that the split hammers are sequentially dropped onto the pile head at regular intervals.
【００１１】またこの発明は、前記杭・地盤系の応答と
して杭頭に作用する荷重の時間波形を測定することを特
徴とする杭の動的載荷試験方法にある。The present invention also relates to a dynamic load testing method for piles, characterized in that the time waveform of the load acting on the pile head is measured as a response of the pile-soil system.
【００１２】さらにこの発明は、前記杭・地盤系の応答
として杭頭に作用する荷重及び杭頭変位の各時間波形を
測定することを特徴とする杭の動的載荷試験方法にあ
る。Further, the present invention resides in a dynamic load testing method for piles, characterized in that each time waveform of a load acting on the pile head and a pile head displacement is measured as a response of the pile-soil system.
【００１３】さらにこの発明は、前記分割ハンマを鉛直
方向に一定間隔で保持し、各分割ハンマの保持を同時に
解除することにより前記一定時間間隔を得ることを特徴
とする杭の動的載荷試験法にある。Further, according to the present invention, the divided hammers are held at a constant interval in the vertical direction, and the fixed time intervals are obtained by simultaneously releasing the holding of the divided hammers. It is in.
【００１４】この発明によれば、分割ハンマを一定時間
間隔で杭頭に落下させることにより、図１に示すような
荷重の時間波形が得られる。荷重の時間波形の各々のピ
ークは、各分割ハンマが杭頭に衝突することにより発生
する。荷重の時間波形の周期Ｔは、ハンマの落下時間間
隔を変えることにより変化させることが可能である。す
なわち、荷重全体としての周波数Ｎ（＝１／Ｔ）を制御
することが可能となり、杭・地盤系の応答を静的な状態
（Ｎ＝０Ｈｚ）に限りなく近づけることができる。According to the present invention, the time waveform of the load as shown in FIG. 1 can be obtained by dropping the split hammer on the pile head at regular time intervals. Each peak of the time waveform of load is generated when each split hammer collides with the pile head. The cycle T of the time waveform of the load can be changed by changing the drop time interval of the hammer. That is, the frequency N (= 1 / T) of the entire load can be controlled, and the response of the pile / soil system can be brought as close as possible to the static state (N = 0 Hz).
【００１５】杭の静的な支持力は、例えば、荷重の時間
波形を解析し、杭の運動方程式を解くことにより推定す
ることができる。図２は、地盤支持力のモデルを示して
いる。地盤支持力は、一般に、杭の変位と抵抗が比例関
係にある弾性領域と、極限抵抗力を示す塑性領域とに分
けて考えられる。The static bearing capacity of the pile can be estimated, for example, by analyzing the time waveform of the load and solving the equation of motion of the pile. FIG. 2 shows a model of ground bearing capacity. The ground bearing force is generally considered as being divided into an elastic region where the displacement of the pile and the resistance are in a proportional relationship and a plastic region where the ultimate resistance is exhibited.
【００１６】杭の運動方程式は、それぞれの領域におい
て、
Ｍ・dx2/dt2＋Ｃ・dx/dt＋Ｋ・ｘ＝Ｆ（弾性領域） …（１）
Ｍ・dx2/dt2＋Ｃ・dx/dt＋Ｒ＝Ｆ（塑性領域） …（２）
ここに、
Ｍ：杭、ハンマ、地盤などの運動質量
Ｃ：速度抵抗（地盤の粘性抵抗）係数
Ｋ：地盤のバネ係数
Ｒ：地盤の極限抵抗
ｔ：時間
ｘ：杭の変位
Ｆ：荷重
となり、（１）、（２）式の各左辺第１、第２項が動的
成分であり、各左辺第３項が静的成分すなわち杭の静的
支持力である。The equation of motion of a pile is as follows: M · dx 2 / dt 2 + C · dx / dt + K · x = F (elastic region) (1) M · dx 2 / dt 2 + C · dx / dt + R = F (plastic region) (2) where, M: kinetic mass of pile, hammer, ground, etc. C: velocity resistance (viscous resistance of ground) coefficient K: spring coefficient of ground R: ultimate resistance of ground t: time x: pile displacement F: load, the first and second terms on the left side of equations (1) and (2) are the dynamic components, and the third term on the left side is the static component, that is, the static bearing capacity of the pile Is.
【００１７】（１）、（２）式のｘ，Ｆは測定により求
めることができる。他方、パラメータＭ，Ｃ，Ｋは、図
１に示した荷重の時間波形を解析することにより推定す
ることができる。荷重の周期Ｔを変え、複数回の打撃を
行うことにより、パラメータの推定精度を上げることが
できる。X and F in the equations (1) and (2) can be obtained by measurement. On the other hand, the parameters M, C and K can be estimated by analyzing the time waveform of the load shown in FIG. The accuracy of parameter estimation can be improved by changing the load cycle T and performing multiple impacts.
【００１８】[0018]
【発明の実施の形態】この発明の実施の形態を図面を用
いて以下に説明する。図３は、載荷試験装置を一部断面
で示す正面図である。アンビル１にはガイドシャフト２
が立設され、ガイドシャフト２の頂部にはフック３が設
けられている。アンビル１は下部に、杭Ｐの頭部に被着
されるパイルキャップ４を有している。測定器として、
荷重を計測するための荷重計５がアンビル１と杭頭との
間に配置され、また杭頭の変位を計測するための変位計
６がパイルキャップ４の側面に配置されている。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a front view showing a partial cross section of the loading test apparatus. Guide shaft 2 on the anvil 1
And a hook 3 is provided on the top of the guide shaft 2. The anvil 1 has a pile cap 4 attached to the head of the pile P at the bottom. As a measuring instrument,
A load meter 5 for measuring the load is arranged between the anvil 1 and the pile head, and a displacement meter 6 for measuring the displacement of the pile head is arranged on the side surface of the pile cap 4.
【００１９】ハンマは複数に分割された分割（段発）ハ
ンマＭ1，Ｍ2…Ｍnからなり、各分割ハンマＭの中央に
はガイドシャフト２への挿通孔７が形成されている。各
分割ハンマＭの質量はほぼ等しく、その形状は円形、角
形等いずれでもよい。The hammer is composed of a plurality of divided (staged) hammers M 1 , M 2 ... M n , and an insertion hole 7 for the guide shaft 2 is formed at the center of each divided hammer M. The masses of the divided hammers M are substantially equal, and the shape thereof may be circular, rectangular, or the like.
【００２０】＜載荷方法＞フック３にワイヤロープ８を
懸吊し、ガイドシャフト２に分割ハンマＭを挿通して各
分割ハンマＭをワイヤロープ８により保持する。ワイヤ
ロープ８には図示しない止め具が設けられ、各分割ハン
マは一定間隔ｄで保持される。フック３を外すことによ
り、各分割ハンマＭの保持が同時に解除される。これに
より、各分割ハンマＭが杭頭に順次落下し、杭頭に衝突
して荷重を発生させる。荷重は荷重計４により計測さ
れ、１回の落下により図１に示したような時間波形が得
られる。また、杭頭の変位は変位計６により計測され
る。<Loading Method> The wire rope 8 is suspended from the hook 3, the split hammer M is inserted through the guide shaft 2, and the split hammer M is held by the wire rope 8. The wire rope 8 is provided with a stopper (not shown), and each split hammer is held at a constant interval d. By removing the hook 3, the holding of each split hammer M is released at the same time. As a result, each of the divided hammers M sequentially falls on the pile head and collides with the pile head to generate a load. The load is measured by the load meter 4, and the time waveform as shown in FIG. 1 is obtained by one drop. The displacement of the pile head is measured by the displacement gauge 6.
【００２１】このような載荷方法において、分割ハンマ
Ｍの一定間隔ｄは落下の際の一定時間間隔（周期Ｔある
いはその逆数である周波数Ｎ）を規定し、間隔ｄを変え
ることにより、落下の時間間隔を変えることができる。
すなわち、荷重全体としての周波数を制御することが可
能となる。In such a loading method, the constant interval d of the split hammer M defines a constant time interval (cycle T or the frequency N which is the reciprocal thereof) at the time of dropping, and the interval d is changed by changing the interval d. You can change the interval.
That is, it becomes possible to control the frequency of the entire load.
【００２２】＜杭の支持力の推定方法＞杭の静的支持力
は、前記のように荷重の時間波形を解析し、（１）、
（２）式で示した運動方程式を解くことにより解析する
ことができるが、例えば以下に説明する方法によっても
解析可能である。<Method of estimating bearing capacity of pile> For static bearing capacity of pile, the time waveform of load is analyzed as described above, and (1),
The analysis can be performed by solving the equation of motion represented by the equation (2), but can also be analyzed by the method described below, for example.
【００２３】載荷周波数と極限荷重との関係から静的
支持力を推定する方法
動的な載荷を行った場合、（１）、（２）式の各左辺第
１、第２項で示される杭の速度あるいは加速度に比例す
る抵抗成分（動的成分）が発生する。したがって、この
動的成分を除去すれば静的成分が得られると考えること
ができる。Method of estimating static bearing capacity from the relationship between loading frequency and ultimate load When dynamic loading is performed, piles indicated by the first and second terms on the left side of equations (1) and (2), respectively. A resistance component (dynamic component) is generated that is proportional to the velocity or acceleration. Therefore, it can be considered that the static component can be obtained by removing the dynamic component.
【００２４】すなわち、この考え方によれば、動的載荷
試験を行ったときに測定される杭頭荷重Ｆは、静的成分
をＦs、動的成分をＦdとすると、
Ｆ＝Ｆs＋Ｆd
で示され、動的成分Ｆdを分離できれば、静的成分であ
る静的支持力Ｆsが得られることになる。ここで、動的
であることと静的であることの違いは、載荷の周波数に
関して静的の場合が０Ｈｚ、動的の場合が０Ｈｚ以外で
あるということである。つまり、動的載荷試験の結果か
ら静的支持力を求めるためには、周波数０Ｈｚでの杭頭
の極限荷重を求めることに帰着する。具体的には以下の
ようにして静的支持力を求めることができる。That is, according to this concept, the pile head load F measured when the dynamic load test is carried out is given by F = Fs + Fd, where Fs is the static component and Fd is the dynamic component. If the dynamic component Fd can be separated, the static supporting force Fs that is the static component can be obtained. Here, the difference between being dynamic and being static is that the loading frequency is 0 Hz in the static case and other than 0 Hz in the dynamic case. In other words, in order to obtain the static bearing capacity from the results of the dynamic load test, it is necessary to obtain the ultimate load of the pile head at the frequency of 0 Hz. Specifically, the static bearing force can be calculated as follows.
【００２５】図３に示すように、周波数をＮＨｚに固定
し、ハンマの落下高さｈを変えて載荷を行い、各落下高
さごとの荷重を測定する（図１参照）。そして、荷重の
時間波形に現れる各分割ハンマ１個当たりのピーク値の
平均値を算出して図４のようにプロットする。これが一
定すなわち極限荷重に達するまで、ハンマの落下高さを
変えて載荷を繰り返し行い、周波数ＮＨｚでの極限荷重
を求める。落下高さの変更によらず、分割ハンマの重量
を変えて載荷を行うことによっても、極限荷重を求める
ことができる。As shown in FIG. 3, the frequency is fixed at NHz, loading is performed while changing the drop height h of the hammer, and the load at each drop height is measured (see FIG. 1). Then, the average value of the peak values for each divided hammer appearing in the time waveform of the load is calculated and plotted as shown in FIG. Until the load reaches a constant value, that is, the ultimate load is changed, the hammer is dropped and the loading is repeated to obtain the ultimate load at the frequency NHz. The ultimate load can be obtained by changing the weight of the split hammer and performing the load without changing the drop height.
【００２６】次に、周波数を変えて前記と同様な載荷を
行い、各周波数Ｎ1Ｈｚ，Ｎ2Ｈｚ，…ＮnＨｚごとの極
限荷重を求める。図５は、このような載荷により得られ
た周波数と極限荷重との関係を示すグラフである。この
グラフにおいて、周波数が０Ｈｚとみなされる場合の極
限荷重が静的支持力Ｆsの推定値である。なお、実際に
グラフを描かないで、演算により同様のことを行っても
よい。Next, the frequency is changed and the same loading as described above is performed to obtain the ultimate load for each frequency N 1 Hz, N 2 Hz, ... N n Hz. FIG. 5 is a graph showing the relationship between the frequency and the ultimate load obtained by such loading. In this graph, the ultimate load when the frequency is considered to be 0 Hz is the estimated value of the static supporting force Fs. In addition, you may perform the same thing by calculation, without actually drawing a graph.
【００２７】杭頭での荷重沈下関係から静的支持力を
推定する方法
静的支持力は、静的載荷試験においては杭頭での荷重沈
下関係から決定される。動的載荷試験においても、前述
のように杭頭に作用した荷重と杭頭の変位（沈下量）が
求められるので、動的な荷重沈下関係を得ることがで
き、これから静的な荷重沈下関係を推定することができ
る。Method of Estimating Static Bearing Force from Load Settlement Relationship at Pile Head The static bearing capacity is determined from the load settlement relationship at the pile head in the static load test. In the dynamic load test as well, the load acting on the pile head and the displacement (settlement amount) of the pile head are obtained as described above, so a dynamic load settlement relationship can be obtained, and from this, a static load settlement relationship can be obtained. Can be estimated.
【００２８】すなわち、周波数Ｎ1Ｈｚ，Ｎ2Ｈｚ，…Ｎ
nＨｚごとに落下高さを変えて行った試験結果から、図
６に示すような動的な荷重沈下量曲線が複数得られる。
これらの荷重沈下量曲線において、変位を固定して考え
ると、動的成分が多くなるほど荷重が大きくなるわけで
あるから、この関係から漸近法により動的成分を除去し
た荷重沈下量曲線、つまり載荷周波数を０Ｈｚとみなせ
る荷重沈下量曲線が得られる。この静的な荷重沈下関係
から、静的載荷試験で行われると同様の手法により静的
支持力を推定することができる。That is, the frequencies N 1 Hz, N 2 Hz, ... N
From the test results obtained by changing the drop height every n Hz, a plurality of dynamic load squat magnitude curves as shown in FIG. 6 are obtained.
In these load squat magnitude curves, if we consider the displacement as fixed, the larger the dynamic component, the larger the load.Therefore, from this relationship, the load squat magnitude curve obtained by removing the dynamic component by the asymptotic method, that is, the load A load squat magnitude curve is obtained in which the frequency can be regarded as 0 Hz. From this static load settlement relationship, the static bearing capacity can be estimated by the same method as that used in the static load test.
【００２９】上記実施の形態は例示にすぎず、この発明
は種々の形態をとることができる。例えば、上記実施の
形態では分割ハンマの間隔を一定とすることにより落下
の時間間隔を一定としたが、落下のタイミングを制御す
ることにより時間間隔を一定とし、所定の載荷周波数を
得ることができる。また、静的な支持力の推定方法につ
いても、種々の手法が考えられる。The above embodiment is merely an example, and the present invention can take various forms. For example, in the above-mentioned embodiment, the time interval of the drop is made constant by making the interval of the split hammers constant, but the time interval is made constant by controlling the timing of the drop, and a predetermined loading frequency can be obtained. . Also, various methods can be considered as a method for estimating static bearing capacity.
【００３０】[0030]
【発明の効果】以上のようにこの発明によれば、動的載
荷試験において荷重の周波数を制御することが可能とな
り、限りなく静的な状態に近い杭・地盤系の応答を得る
ことができるようになった。As described above, according to the present invention, it becomes possible to control the frequency of the load in the dynamic load test, and it is possible to obtain a response of the pile-ground system which is as close to a static state as possible. It became so.
【図１】図１は、この発明による載荷試験の実施により
得られる荷重の時間波形を示す図である。FIG. 1 is a diagram showing a time waveform of a load obtained by carrying out a load test according to the present invention.
【図２】図２は、載荷時の杭変位・地盤支持力のモデル
を示す図である。FIG. 2 is a diagram showing a model of pile displacement / ground support force during loading.
【図３】図３は、載荷装置の一例を示す一部断面模式図
である。FIG. 3 is a schematic partial cross-sectional view showing an example of a loading device.
【図４】図４は、周波数を固定した場合のハンマの落下
高さと荷重との関係を示すグラフである。FIG. 4 is a graph showing the relationship between the drop height and the load of the hammer when the frequency is fixed.
【図５】図５は、周波数と極限荷重との関係を示すグラ
フである。FIG. 5 is a graph showing the relationship between frequency and ultimate load.
【図６】図６は、動的な荷重沈下関係と、それから推定
される静的な荷重沈下関係を示すグラフである。FIG. 6 is a graph showing a dynamic load settlement relationship and a static load settlement relationship estimated from it.
１…アンビル ２…ガイドシャフト ３…フック ５…荷重計 ６…変位計 ８…ワイヤロープ Ｍ…分割ハンマ 1 ... Anvil 2 ... Guide shaft 3 ... Hook 5… Load cell 6 ... Displacement meter 8 ... Wire rope M ... Split hammer
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G01L 5/00 E02D 1/02 ─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. 7 , DB name) G01L 5/00 E02D 1/02
Claims (4)
答から杭の支持力を推定する動的載荷試験法において、 前記ハンマとして複数に分割された分割ハンマを用い、
前記分割ハンマを一定時間間隔で杭頭に順次落下させる
ことを特徴とする杭の動的載荷試験法。1. A dynamic load test method for dropping a hammer on a pile head and estimating the bearing capacity of the pile from the response of the pile-ground system, wherein a divided hammer divided into a plurality of pieces is used as the hammer,
A dynamic loading test method for piles, characterized in that the divided hammers are sequentially dropped onto a pile head at regular time intervals.
る荷重の時間波形を測定することを特徴とする請求項１
記載の杭の動的載荷試験方法。2. A time waveform of a load acting on a pile head is measured as a response of the pile-soil system.
Dynamic load test method for piles described.
る荷重及び杭頭変位の各時間波形を測定することを特徴
とする請求項１記載の杭の動的載荷試験方法。3. The pile dynamic loading test method according to claim 1, wherein each time waveform of a load acting on a pile head and a pile head displacement is measured as a response of the pile-soil system.
持し、各分割ハンマの保持を同時に解除することにより
前記一定時間間隔を得ることを特徴とする請求項１、２
又は３記載の杭の動的載荷試験法。4. The fixed time interval is obtained by holding the split hammers at a fixed interval in the vertical direction and releasing the hold of each split hammer at the same time.
Or, the method for dynamically loading piles described in 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32612296A JP3503100B2 (en) | 1996-11-21 | 1996-11-21 | Dynamic loading test method for piles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32612296A JP3503100B2 (en) | 1996-11-21 | 1996-11-21 | Dynamic loading test method for piles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10153504A JPH10153504A (en) | 1998-06-09 |
| JP3503100B2 true JP3503100B2 (en) | 2004-03-02 |
Family
ID=18184326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32612296A Expired - Lifetime JP3503100B2 (en) | 1996-11-21 | 1996-11-21 | Dynamic loading test method for piles |
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| Country | Link |
|---|---|
| JP (1) | JP3503100B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006342579A (en) * | 2005-06-09 | 2006-12-21 | Ybm Co Ltd | Pile driver equipped with dynamic load test device |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4614567B2 (en) * | 2001-04-05 | 2011-01-19 | 株式会社トーヨーアサノ | Pile rapid loading test apparatus and pile rapid loading test method |
| JP4889886B2 (en) * | 2001-08-02 | 2012-03-07 | 多摩火薬機工株式会社 | Test method for bearing capacity of buried underground piles |
| JP3889344B2 (en) * | 2002-10-04 | 2007-03-07 | 日本基礎技術株式会社 | Analytical method of pile loading test |
| KR100779486B1 (en) | 2006-08-29 | 2007-11-26 | (주)백경지앤씨 | Apparatus and method for dynamic pile load test |
| JP2011059027A (en) * | 2009-09-14 | 2011-03-24 | System Keisoku Kk | Loading apparatus |
| CN108318326B (en) * | 2018-01-19 | 2020-11-20 | 浙江大学 | Miniature static sounding probe rod |
| CN108593446B (en) * | 2018-04-28 | 2020-10-23 | 青岛理工大学 | Multi-anchor fiber rib anti-floating anchor rod system collaborative stress testing method |
| CN111693384B (en) * | 2020-06-18 | 2022-12-06 | 杭州大地工程测试技术有限公司 | Equipment for pile foundation high strain detection and detection method using equipment |
-
1996
- 1996-11-21 JP JP32612296A patent/JP3503100B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006342579A (en) * | 2005-06-09 | 2006-12-21 | Ybm Co Ltd | Pile driver equipped with dynamic load test device |
| JP4545049B2 (en) * | 2005-06-09 | 2010-09-15 | 株式会社ワイビーエム | Pile driver with dynamic loading test equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10153504A (en) | 1998-06-09 |
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